Riding leashless is inexcuseable IMO. It's not just your kite at risk, but like i think murdoc said, you are being a potential killer. When I help someone launch, I DO say "Hey, you forgot your leash!" If they say naw, I'm not wearing one, I then tell them "Well, then you aren't ready to be launched yet" and I drop their kite and walk away.
For the record, I can do one hell of alot of shit with a leash attached to me. IF I want to try something like a handle pass or other that would be hindered by my leash, i go way WAY away from everyone else, WAY offshore, and disconnect it for the trick attempt. After I do it or try it, I reconnect the leash. You CAN be a stylish rider being leashed up!
Also, if I have my ski or boat on the water or beach...or even if I dont, and a leashless rider loses his kite, my boat, my ski and ME are off limits to him for retrieving it. I damn sure did set and watch a kite get blown out to sea while my ski was setting there idle and ready to go get it. The guy was furious at me for not chasing it for him and wouldnt shut up about it and even resorted to name calling...but I told him basically that "he needs to SHUT UP and get the Phuck out of my face. You made the decision to ride leashless, so now YOU will deal with that decision and it's consequences, NOT ME!"
Everyone around me knows how I stand on this too. One time, a leashless rider lost his kite and it was down blowing downwind, headed my way. He shouted at me to please try to catch it for him(while I was riding) since I was the only one left downwind of the kite. SO, I approached it with much caution, and when I got to it, I jumped over it, keft it lay to blow off and rode away. Again, this almost led to a fight on the beach, but I told him the same i tell them all as I said above. YOUR kite is not MY PROBLEM...unless it becomes entangled in my kite. THEN, if I can, I'll just cut your loose and let it go if that's an option.
I rider responsibly and I expect the same from those around me. Those who dont...they pay. It may take some time, but they will pay. And slowly but surely, I am having an impact on the area. What used to be somethign like 90% leashless with 10% using leashes, has now become something more to the effect of 95% using leashes. We have now less than 10 riding leashless. They are all slowly but surely getting the picture. You CAN have some influence on the people around you, and especially if you are a higher profile rider in that area. Be a role model and set some examples!